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A Pokedex that is actually useful.
Seriously, we've gone 8 generations with 0 innovations on the Pokedex. Its only function has been a completionist checker and a quick way to find where Pokemon are located.
The Pokedex should be a super comprehensive tool that ultimately makes it so people don't have to look up Serebii or Bulbapedia.
Consider the following, at the start of the game, your Pokedex can:
-Tell you the level-up moves of all Pokemon you've caught.
-Tell you the EVs, IVs, Base Stats, Abilities, Experience Growth and Egg Moves/Groups of all Pokemon you've caught.
When you encounter a wild Pokemon, you now have a fifth option to scan it. This takes up a turn, but it reveals that Pokemon's Nature, Base Stats, Ability etc. You can tie a progression system to it, so as you upgrade your Pokedex, your scan also reveals a Pokemon's IVs, current moves, held item, etc.
I'm really just tired of trawling through wikis of info when it should all be accessible in the game.